Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.32k&link_type=abstract
"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,
Physics
Scientific paper
Simultaneous measurement of magnetic field at the photosphere and chromosphere in three active regions have been carried out using a dual-beam spectropolarimeter at Kodaikanal. All three active regions are different in their field distribution as seen in intensity structures. The vector magnetic field at the photosphere is derived through Milne-Eddington inversion of Fe I line at ?6569 and at the chromosphere using weak-field-approximation method applied to H? Stokes profiles. The vector field obtained at the photosphere is found to be consistent with earlier observations. In the chromosphere, the field topology inferred from H ? observations agree qualitatively with the intensity structures at ultra-violet and X-ray wavelengths observed by SOHO/EIT and Hinode/XRT, respectively. One of the three active regions is an isolated sunspot exhibiting fountain like structures in X-ray wavelengths. Another active region, which possesses a simple and round sunspot but surrounded by opposite polarity activities, show closed loop structures in X-rays with one of their foot points located in the main sunspot and another in the nearby active region. The third active region, which is also an isolated sunspot but, with its umbra possessed by four light bridges and partially covered penumbra. The EUV structures observed above this active region indicate more complicated structuring of the chromospheric and coronal magnetic fields. The signatures of magnetic field structuring in the higher layers of solar atmosphere are clearly evident in the derived chromospheric vector magnetic field. Further, we explore the possibility of using these measurements to understand the coronal magnetic fields through extrapolation techniques.
Kasiviswanathan S. S.
Komandur R.
Krishnappa N.
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